The following problem refers to strings in A, B, ..., Z.

label Mathematics
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Jun 21st, 2015

Thank you for the opportunity to help you with your question!

Since, the 4 letter string starts with S
for the remaining 3 letters we have, 26 choices( A to Z)

So, total 4 letter strings starting with S = 26*26*26 = 17576

Please appreciate my help and select my answer as the best! Thanks :)
Jun 21st, 2015

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